Winning With Opposite Colored Bishops! – Part 2

In part 2 of GM Finegold's series, he has a trick that even Houdini can't perform - neither Harry nor the silicon version! It's one of the most famous single moves of all-time. The exhaustive analysis shows it was the best move, but how far in advance did Alexei Shirov see the idea? We all know you need multiple passed pawns to win Opposite Color Bishop endings, but this was taking that maxim to the extreme!